EP3139470B1 - Rotor body with permanent magnets and rotating electrical machine comprising such a body - Google Patents
Rotor body with permanent magnets and rotating electrical machine comprising such a body Download PDFInfo
- Publication number
- EP3139470B1 EP3139470B1 EP16182076.6A EP16182076A EP3139470B1 EP 3139470 B1 EP3139470 B1 EP 3139470B1 EP 16182076 A EP16182076 A EP 16182076A EP 3139470 B1 EP3139470 B1 EP 3139470B1
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- EP
- European Patent Office
- Prior art keywords
- rotor body
- radial
- strips
- magnets
- axial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
Definitions
- the present invention relates to a rotor body with permanent magnets and a rotating electrical machine, including an alternator and / or an electric motor for a motor vehicle, comprising such a body.
- a conventional rotary electric machine such as an alternator, a reversible alternator called alternator-starter or an electric motor has two coaxial parts, namely a stator surrounding a rotor having a body, such as a pack plate, secured to a rotor shaft leading and / or driven.
- the stator comprises a body, such as a bundle of sheets, carrying a stator winding, preferably of the polyphase type. To do this the stator body has notches, open or closed, traversed by the winding of the stator extending on either side of the body of the stator for formation of buns.
- the stator winding may comprise several windings, namely at least one winding per phase, mounted in a star or a triangle for forming a winding, for example of the three-phase, pentaphase or hexaphase type.
- a DC rectifier bridge for example a diode bridge for forming an alternator, or an inverter, for example a transistor bridge of the MSFET type for forming an alternator or an electric motor, is associated with windings of the stator winding.
- An air gap is present between the inner periphery of the stator body and the outer periphery of the rotor laminations.
- the machine also comprises a housing, conventionally made of aluminum, having at least one front flange and a rear flange.
- the flanges are usually hollow in shape and each have a bottom extended at its outer periphery by an outer peripheral skirt.
- the skirt (s) carries (s) the body of the stator mounted in the skirt or skirts by press fitting, in particular by hooping, or via elastic buffers.
- the bottoms of the flanges each centrally have a housing for mounting the outer ring of a ball bearing.
- the inner ring of the ball bearings is traversed by the rotor shaft rotatably mounted in the housing as described for example in the document WO 02/054566 which will be referred to for more details.
- the machine is internally ventilated by being located at the front face of the engine of the motor vehicle.
- the rotor shaft is driven by the combustion engine of the motor vehicle via a motion transmission device comprising at least one belt and a pulley secured to the front end of the rotor shaft, the electric machine may be reversible and constitute an alternator / starter operating in alternator mode when the rotor shaft is driving and in electric motor mode for rotating the rotor shaft.
- the rotor of this document comprises a protruding poles rotor body carrying coils and permanent magnets.
- the rotor shaft carries a collector with electrically conductive rings for powering the coils.
- the magnets are buried axially in the bundle of laminations of the rotor body being axially oriented relative to the axis of axial symmetry of the rotor shaft.
- the body of the rotor has a magnetic part in the form of a pack of sheets interposed between a first flange and a second flange.
- the magnetic part is carried by a central core constituted by the inner periphery of the magnetic part pierced centrally for its connection in rotation to the knurled rotor shaft for its press fit into the central core.
- the machine is located at the rear face of the engine of the motor vehicle with the presence of at least one clutch as described for example in the documents FR 2 7782 356 , FR 2,830,589 and FR 3,005,900 to which we will refer.
- the casing comprises a peripheral spacer carrying the body of the stator. This spacer is located between the front end of the block of the engine block of the motor vehicle, constituting the front flange, and the bell of the gearbox of the motor vehicle constituting the rear flange of the housing.
- the rotor shaft is constituted by an extension of the reaction plate of the clutch integral with the crankshaft driving the engine of the vehicle or by a driven shaft coupled via a clutch or a torsion damper of the driven shaft of the gearbox.
- the elastic means with axial action consist of elastic tabs cut in the second flange for axial support on the magnets.
- the elastic means with radial action are distinct from the elastic means with radial action.
- the copper winding of the rotor of the prior art, as well as the slip rings and the brushes, is eliminated, which makes it possible to reduce the axial size as well as the number of parts and the mass of copper.
- the performance of the electrical machine is not reduced because the number of permanent magnets is increased because they are implanted in the radial housings of the magnetic part.
- the tolerances can be increased. manufacturing magnets, said resilient means catching the axial clearances.
- the magnets may therefore be shorter than the axial distance separating the second flange from the first shoulder after mounting the fasteners.
- the internal diameter of the rotor body can be increased and therefore, referring to the documents FR 2,830,589 and FR 3,005,900 , increase the radial size of the disengagement device and that of the bearing, such as a ball bearing, which increases the life of the rotating electrical machine. It may be desirable to further simplify the rotor with permanent magnets and elastic means with radial and axial action of the document FR 3,008,252 that can be mounted in documents WO 02/054566 , FR 2 7782 356 , FR 2,830,589 and FR 3,005,900 .
- the documents WO 2013/057673 , US 2010/001605 , EP 2,509,197 and EP 2 141 783 disclose permanent magnet rotors having attachment means for the magnets.
- the present invention aims to meet these wishes.
- the solution according to the invention is simple and economical because it uses bands of material around and retaining the magnets during operation of the rotating electrical machine. It creates a manipulable, transportable and captive rotor body. More precisely, the strips of material are immobilized in rotation by shape cooperation with the tenons; said strips incorporating elastic means axial and radial action so that one can remove the second flange of the prior art.
- the magnets work in good conditions being immobilized radially and axially with force and without significant stress on the magnets. This increases the life of the machine in a safe manner, the effects of the centrifugal force being reduced by the presence of the bands.
- the rotor body may be integral with a motion transmission flange or a rotor shaft. Thanks to the invention, the number of parts is reduced.
- the rotor body can be manufactured in a first place and assembled in a second place or in the same place with the motion transmission flange or with a rotor shaft.
- the strips of material may be of non-magnetic material.
- the strips of material may be metallic, for example stainless steel, for reducing the radial and axial dimensions.
- a rotating electrical machine such as an alternator, a starter-alternator or an electric motor vehicle motor is characterized in that it comprises such a rotor body.
- the elastic means with radial action facilitate the mounting of the magnets belted by the strips, the elastic means with radial action being deformed during assembly of the magnets in the housings.
- the elastic means with radial and axial action facilitate the latching of the means of the latching means intervening at the level of the third portion of the strips, since it is possible to deform said elastic means.
- the rotor body 1 of a rotating electrical machine is, for cost and axial size reductions, without winding and thus with slip rings and brushes, which also makes it possible to reduce the number of parts and to simplify the rotor body.
- This body comprises permanent magnets 20 mounted in radial housings 3 that the body 1 presents.
- radial housings 3 that the body 1 presents.
- a plurality of magnets is mounted in the housing 3.
- all housing Radials 3 are occupied by a permanent magnet to have a high power electric machine.
- some housing 3 may be empty.
- the body 1 is annular.
- the body 1 has centrally an axis of axial symmetry X ( Figure 1 ). The circumferential, radial, transverse and axial directions will be made with respect to this axis X, which constitutes the axis of rotation of the not shown rotor shaft.
- This body 1 comprises a magnetic part 4 and a central core 100 for supporting the magnetic part 4.
- magnetic material is meant a material capable of transmitting a magnetic flux, such as ferromagnetic material, for example a pack of sheets.
- a non-magnetic material, such as stainless steel, aluminum, plastic or brass, as opposed to a magnetic material, is a poor magnetic flux conductor. This non-magnetic material can even prevent any transmission of the magnetic flux. It reduces or eliminates magnetic leakage.
- the magnetic part 4 comprises radial housings 3 for permanent magnets, in particular made of ferrite or of rare earth, such as neodymium-iron-boron magnets (NdfeB) or Samarium Cobalt-based magnets (SmCo).
- the magnetic part 4 may be annular in shape and consist of a bundle of sheets as visible in FIG. figure 1 .
- the core 100 may belong to the magnetic part by constituting the continuous inner periphery thereof as visible to the figure 1 .
- the core may be constituted by a hub or a rotor shaft, preferably of non-magnetic or slightly magnetic material, bearing the magnetic part. This soul may be ring-shaped.
- the body 1 of the rotor may be integral with a flange end of motion transmission, which may be configured to be rotatably connected to a rotor shaft as described for example in the document FR 2,830,589 which will be referred to for more details.
- This document describes a rotating electrical machine implanted between the crankshaft of the engine of the motor vehicle and the input shaft of the gearbox thereof.
- the rotor of this electrical machine is rotatably connected to a rotor shaft constituting an intermediate shaft carrying a friction disk belonging to a first clutch, the reaction plate of which is integral with the crankshaft of the engine. thermal of the motor vehicle.
- this shaft is configured to be rotatably connected to the reaction plate of a second clutch, whose friction disk is integral in rotation with the input shaft of the gearbox.
- a bearing is interposed radially between the outer periphery of the rear end of the intermediate shaft and the inner periphery of a web interposed between the first clutch and the rotor of the electric machine.
- the sail belongs to a spacer interposed, as above, between the housing of the engine block of the motor vehicle and the bell of the gearbox. This spacer partly carries the stator of the electric machine.
- the web has at its inner periphery an inclined annular inner portion carrying at its free end a bearing surface, such as a bearing.
- the intermediate shaft passes through the disengagement device of the first clutch.
- This device is in one embodiment a self-centering stop with hydraulic control.
- the disengaging device is a self-centering cable-operated stop.
- the stop is housed inside the inner portion of the web.
- the rotor comprises a pack of plates carried by a hub integral with a flange constituting the reaction plate of the second clutch.
- This flange of motion transmission in the light of this document, may include an internal flange for its connection in rotation to a flange that has the intermediate rotor shaft.
- FR 3005 900 above referred to the movement of the flange is secured to a friction disc.
- the flask visible in these two documents is not represented here.
- the rotor body may be rotatably connected to the rotor shaft via its central core belonging to the magnetic part as described in the document. WO 02/054566 supra.
- the rotor body may be rotatably connected to the rotor shaft via its hub constituting the central core of the rotor body. To do this in both cases the rotor shaft can be knurled for its press fitting into the central bore of the core.
- the rotor shaft may be non-magnetic or slightly magnetic material.
- elastic means with axial action are used carried by a strip of material 10 associated with each magnet 20 and surrounding the associated magnet.
- the strips 10 and their magnets 20 are 3.
- Each strip 10 constitutes a retaining band of the magnet 20, as described below, and is configured to constitute elastic means with radial action protecting the magnets subjected to the action of the centrifugal force. so that no retaining element, such as pads or other is expected.
- the strips 10 oppose the axial and radial movements of the magnets Rotation locking means intervene between the core 4 and the strips 10.
- the material strip 10 may be made of non-magnetic material It may be metallic to reduce its axial and radial dimensions. This band 10 may be stainless steel.
- the elastic means with radial action 16 belong to the first portion 11 of a strip 10 and bear on the central core 100 and on the internal radial face 21 of the associated magnet 20 to solicit the third portion 14 of the strip 10 and the outer radial face 24 of the associated magnet 20 towards the periphery external housing 3 concerned.
- Studs 2 and mortises 12 constitute simply and economically means for locking in rotation.
- the tenons 2 are implanted in the figures centrally at the inner periphery of the housings 3.
- the magnets 20 furthermore have two lateral faces facing two consecutive arms 4 that the magnetic part 4 has as described below.
- the elastic means 16 'axial and radial action 16 exert a holding force on the magnets when the electric machine rotates and without exerting significant stress on the magnets.
- the width and thickness of the strips of the strips are selected to exert on the faces of the magnet the necessary holding force in all circumstances during the rotation of the machine.
- the width of the strips is less than or equal to the mounting clearance close to that of the housings 3.
- the length of the strips, corresponding to those of the second portions 13, is a function of the length of the housing.
- the magnetic part 4 of the body 1 comprises a plurality of radial elementary arms 4 of magnetic material integral with the central core 100, which itself comprises a plurality of elementary souls 100 each having pins 2.
- the core 100 may be cylindrical and be assembled, in the aforementioned manner, with a nonmagnetic rotor shaft, for example knurled for its force fitting in the cylindrical internal bore of the core 100.
- the arms 4 are distributed circumferentially in a regular manner while being separated by one another. others by slits. They each belong to a plurality of washers each comprising an elementary center core with tenons 2 and elementary arm 4 sheet metal These plates are stacked on top of each other for forming the body 1 and reducing eddy currents.
- These sheets are ferromagnetic material with possibly a coating.
- the sheets have a small thickness for example of 0.3 to 0.35 mm
- the outer periphery of the arms 4 delimits the gap with the inner periphery of the stator body of the rotating electrical machine.
- the arms 4, in the form of annular sector, are each provided at their outer periphery with circumferential extensions 5 extending on either side of each arm 4.
- the extensions 5 limit magnetic leakage between two adjacent arms, an existing set between the extensions 5, directed towards one another, two adjacent arms.
- the body 1 of the rotor is thus open at its outer periphery and the slots between two adjacent arms have a reduced width at the outer periphery of the arms at the extensions 5.
- the central core delimits the inner periphery of the radial housings 3 so that these are blind housings.
- the tenons 2 project radially at the outer periphery of the core 100 and centrally with respect to the inner periphery of the housings 3 constituting the bottom of the housings 3.
- Radially below the lips 5, the lateral faces (not referenced) vis-à-vis two radial arms 4 are in these embodiments parallel and convergent towards the inner periphery of the housing 3 delimited by the central core 100 (See figures 1 ).
- the blind housings 3 therefore have a reduced width at their inner periphery to be able to increase the number of housings 3 for the same external diameter of the core 100.
- the housings 3 serve as aforesaid for mounting and housing strips 10 and associated magnets 20 belted by the strips 10.
- the permanent magnets 20 may be ferrite. These magnets are resistant to centrifugal force and are economical.
- the magnets 20 here have a generally parallelepiped shape.
- the section of the magnets 20 is in an embodiment of rectangular or square shape. In this embodiment, as visible in FIG. figure 3 , the magnets 20 have a top portion of trapezoidal section comprising the outer radial face 24. This top portion is extended radially inward towards the core by an inner portion of rectangular or square section.
- the housings 3 are of radial orientation.
- the magnets 20 each comprise two lateral faces defining a North pole and a South pole.
- the two lateral faces thereof are vis-à-vis the same pole of the two magnets surrounding said arm. It is thus formed in a circumferential and alternating manner North magnetic arms and South magnetic arms. This results in a high number of North and South poles in a reduced axial size.
- the number of magnets 20 and arms depends on the applications. Preferably the number of the arms 4, housing 3 and magnets 20 is equal to at least 10.
- the blind housings 3 are delimited internally by the outer periphery of the core 100. Thanks to these arrangements we obtain a rotating electrical machine compact axially and powerful in a simple and economical way.
- the arms 4 may advantageously each have a hole for the passage of fasteners, which may be magnetic material or non-magnetic material.
- the fasteners may be metallic and may consist of screws, such as tie rods, rivets studs or bolts.
- the body 1 will have a constant thickness and the sheet package may consist of an assembly that can be handled and transported by means of additional fasteners, preferably of non-magnetic material, passing through additional aligned holes made in the sheet package.
- Flanges of non-magnetic material, such as aluminum may be placed on either side of the sheet package 4, 100 as in the document WO 02/054566 above and be assembled with the sheet package via the fasteners.
- the radial housings 3 may be devoid of slots and thus closed at their outer periphery.
- the housings 3 may therefore be delimited internally by the outer periphery of the central core and externally by the outer periphery of the magnetic part.
- the strips 10 are locked in favor of a connection with latching means 15, which affect the third portion 14 of the strips.
- the third portion 14 of the band comprises two parts, one of the parts having a hole while the other part has an inclined tab intended to penetrate into the snap-locking hole parts.
- the elastic means with axial action 16 'favor the latching of the two parts of the third portion 14.
- the hole portion of the third portion of the strips 10 is narrower than that comprising the inclined leg.
- the hole portion extends one of the second portions 13 by being bent at 90 °.
- This hole portion is shorter than that comprising the inclined lug, the latching means being implanted in the vicinity of one end of the third portion 14 of a strip.
- the outer periphery of the tabs of the latching means 15 extends over a circumference less than that of the lips as visible in FIG. figure 1 .
- the elastic means with radial action 16, 16 'and axial of a strip are respectively formed in favor of a convex shape of the first portion 11 of the strip and in favor of a convex shape of least one of the second portions 13 of the strip.
- the axial-action elastic means 16 ' are formed by means of a convex shape of each of the second portions 13 of the strip.
- the mortise 12 of a band affects the convex shape of the first portion 11 of the band so that the first portion of the band is split (see FIG. figure 2 ).
- This mortise at a size that is a function of that of its associated post 2 carried by the soul.
- the curved forms are formed by means of folds (see Figures 3 and 4 ). It is apparent from the description and figures that the curved shapes of the elastic means 16 'axial and radial action 16 support locally via their top on the faces vis-à-vis a magnet surrounded by the band.
- the elastic means with radial action 16 are preserved.
- This second embodiment differs from the first embodiment in that the elastic means with axial action are modified.
- These elastic means with axial action 16 ' are formed in favor of inclined tongues from at least one of the second portions 13 of a strip.
- the tabs project in the direction of the associated faces of the magnets 20.
- the other second portion 13 may also be provided with an inclined tongue.
- the other portion may have a curved shape as in the first embodiment
- the tongues may be obtained by cutting and folding from the second portions of the strip.
- the free end of the inclined tongues has a curved shape for local contact with the face vis-à-vis the associated magnet 20.
- the central core 100 consists of a hub or sleeve of non-magnetic material and the arms 4 of the magnetic part are attached to this hub.
- a mechanical connection may occur between the inner periphery of the arms and the hub.
- the mechanical connection may consist of a clamping of the inner periphery of the arms on the outer periphery of the hub.
- the mechanical connection may consist of a press fit of the arms on the hub, or a connection with shaped co-operation.
- the mechanical connection may consist of a splined connection, or a tenon type mortise connection, or a dovetail connection.
- the tenons are integral with the hub or the sleeve and the arms 4 are attached to the hub or the sleeve.
- the strips 10 may be in the form of that of the first or second embodiment.
- the arms of magnetic material are generally of radial orientation and separated from one another by slots.
- the permanent magnets and the strips 10 are mounted in the slots separating the arms 4 in pairs and defining with the hub radial mounting housings of the magnets.
- One end of the central core may be integral with a motion transmission flange as described in the documents FR 2,830,589 and FR 3,005,900 which will be referred to for further details.
- the movement transmission flange may be in one piece with the hub constituting the central core.
- the hub may be attached to the motion transmission flange
- the hub may be attached by welding, in particular of the laser type, or crimping on the motion transmission flange.
- the flange of motion transmission may comprise at its outer periphery a flange configured to be attached to one of the components of a clutch.
- the flange may be axially offset in the opposite direction relative to the arms of the magnetic part;
- the motion transmission flange may be extended inward by a rotational connection flange to an intermediate rotor shaft;
- the fixing flange may be perforated for fixing with fasteners, such as rivets, on a flange that has the intermediate rotor shaft;
- the mounting flange may have teeth for its spline connection with the intermediate rotor shaft.
- body 1 is in place of that of documents FR 2,830,589 and FR 3,005,900 .
- the axial size of the rotor body is reduced as well as the axial size of the stator body and therefore the mass of the winding carried. by the stator body which reduces the cost of the rotating electrical machine.
- the outer diameter of the sheet package can reduce the inner diameter thereof.
- the hub made of non-magnetic material may be connected to a rotor shaft, for example by force-fitting knurled portions of the shaft into the internal bore of the hub.
- Fixing members may be provided, as in the first embodiment, passing through the arms 4 and assembled with a flange integral with the hub, the mounting of the arms on the hub being made as described above.
- the radius of the outer periphery of the arms 4 is not constant for reducing magnetic noise and vibrations. In a variant, the radius of the outer periphery of the arms 4 is constant, as is the gap between the stator and the rotor of the rotating electrical machine.
- the lip-shaped extensions 5 constitute shoulders for the retaining strips 10 of the magnets 20 and delimit the reduced width of the stepped slots. circumferential width due to the presence of a clearance between the lips 5 of two consecutive arms. Note that the width of this game (see figure 1 ) is greater than or equal to that of the latching means 15.
- the lips 5 are joined so that the housing 3 may be closed at their outer periphery. In this case, the lips 5 must be hollowed centrally for the passage of the latching means 15. In variants the dwellings may be of constant width.
- the magnets belong to a magnetic assembly comprising a magnet and at least a portion of non-magnetic material fixed, for example by gluing, on the inner periphery of the magnet and of reduced radial height.
- the elastic means with radial action act vi the strips on the nonmagnetic portion.
- the magnets 20 belong to a magnetic assembly comprising two magnets bonded together. These magnets may not be of the same nature, one being for example ferrite and the other in rare earth. Of course, all combinations are possible.
- the magnetic assembly may comprise at least one ferrite magnet, another magnet and at least a portion of non-magnetic material.
- the magnets are rare earth, for example neodymium-iron-boron. Thanks to magnetic assemblies magnets can be standardized and according to the applications and the size of the housings 3.
- a magnetic target advantageously provided with North and South poles
- a sensor holder for example Hall effect associated with the magnetic target as described in the document FR 2,745,44 to which we will refer
- the rotor 1 rotating body electrical machine may be equipped with a rectifier bridge of ac current in DC visible partially in the document WO 02/054566 . It will then consist of an alternator for example of a motor vehicle.
- the rotary electric machine with rotor body 1 can be equipped with an inverter such as described for example in the document FR 2,745,444 .
- it may consist of an alternator-starter as in the documents FR 2,830,589 .
- the alternator / starter of this document can be modified FR 2,830,589 for the flange carrying the bearing to belong to a housing interposed axially between the engine block and the bell of the gearbox so that the rotating electrical machine belongs to a hybrid module comprising the rotating electrical machine with a rotor body according to the invention, the disengaging device and a torsion damper secured to the first flange 13 as described in the document FR 3,005,589 .
- the hub 12 may be integral with the input shaft of the gearbox.
- the casing carrying the stator may be cooled by a circulation of fluid, such as the cooling fluid of the vehicle.
- This alternator-starter may belong to a range extender of an electric vehicle, said extension comprising a heat engine associated with the alternator-starter to form a generator to recharge the batteries of the electric vehicle.
- the alternator / starter may be rotated by the engine of the motor vehicle via a transmission device to at least one belt and thus turn faster which is made possible thanks to the strips 10.
- the rotary electric machine with rotor body 1 may be an electric motor, such as an electric motor of an air-conditioning compressor, for example of the "scroll" type described in the document EP 1 865 200 .
- the rotating electrical machine such as an alternator, a starter-alternator or a motor vehicle electric motor
- the rotating electrical machine is advantageously of the polyphase type, for example of the three-phase, pentaphase or hexaphase type.
- the stator of the rotating electrical machine may comprise, in known manner, a body stator with teeth in particular for mounting concentric coils.
- This stator body may have a number of teeth greater than the number of magnets, for example 72 teeth for 24 arms 4.
- the axial length of the stator body may be less than the axial length of the arms 4.
- the number of arms 4 is equal to at least 10.
- the stator body may carry a corrugated type winding formed from continuous conductor wires or in the form of conductive segments, as described for example in the document EP 0 881 742 .
- the present invention makes it possible to reduce the volume of the magnets of the order of 35 to 40% as well as magnetic flux leakages, in particular because the hub is made of non-magnetic material. It also reduces costs, rotor weight and increases the internal diameter. It may not be possible to use rare earth magnets, simple ferrite magnets being sufficient. The rotor with arms reported resists the action of the centrifugal force.
- segmented arms 4 in combination with the poor magnetic flux conductor hub make it possible to reduce the magnetic leakage and therefore the mass of the rotor.
- the mass of iron due to the presence of the arms 4 is also reduced which reduces the price of the electric machine.
Description
La présente invention concerne un corps de rotor à aimants permanents et une machine électrique tournante, notamment un alternateur et/ou un moteur électrique pour véhicule automobile, comportant un tel corps.The present invention relates to a rotor body with permanent magnets and a rotating electrical machine, including an alternator and / or an electric motor for a motor vehicle, comprising such a body.
Ainsi qu'on le sait une machine électrique tournante conventionnelle- telle qu'un alternateur, un alternateur réversible appelé alterno-démarreur ou un moteur électrique - comporte deux parties coaxiales à savoir un stator entourant un rotor présentant un corps, tel qu'un paquet de tôles, solidaire d'un arbre de rotor menant et/ou mené.As is known, a conventional rotary electric machine such as an alternator, a reversible alternator called alternator-starter or an electric motor has two coaxial parts, namely a stator surrounding a rotor having a body, such as a pack plate, secured to a rotor shaft leading and / or driven.
Le stator comporte un corps, tel qu'un paquet de tôles, portant un bobinage de stator de préférence du type polyphasé. Pour ce faire le corps du stator comporte des encoches, ouvertes ou fermées, traversées par le bobinage du stator s'étendant de part et d'autre du corps du stator pour formation de chignons.The stator comprises a body, such as a bundle of sheets, carrying a stator winding, preferably of the polyphase type. To do this the stator body has notches, open or closed, traversed by the winding of the stator extending on either side of the body of the stator for formation of buns.
Le bobinage du stator peut comporter plusieurs enroulements, à savoir au moins un enroulement par phase, montés en étoile ou en triangle pour formation d'un bobinage par exemple du type triphasé, pentaphasé ou hexaphasé. Un pont redresseur de courant alternatif en courant continu, par exemple un pont de diodes pour formation d'un alternateur, ou un onduleur, par exemple un pont à transistors du type MSFET pour formation d'un alternateur ou d'un moteur électrique, est associé aux enroulements du bobinage du stator.The stator winding may comprise several windings, namely at least one winding per phase, mounted in a star or a triangle for forming a winding, for example of the three-phase, pentaphase or hexaphase type. A DC rectifier bridge, for example a diode bridge for forming an alternator, or an inverter, for example a transistor bridge of the MSFET type for forming an alternator or an electric motor, is associated with windings of the stator winding.
Un entrefer est présent entre la périphérie interne du corps du stator et la périphérie externe du paquet de tôles du rotor.An air gap is present between the inner periphery of the stator body and the outer periphery of the rotor laminations.
La machine comporte également un carter, classiquement en aluminium, présentant au moins un flasque avant et un flasque arrière. Les flasques sont le plus souvent de forme creuse et présentent chacun un fond prolongé à sa périphérie externe par une jupe périphérique externe. La ou les jupes porte (nt) le corps du stator monté dans la ou les jupes par emmanchement à force, notamment par frettage, ou via des tampons élastiques. Les fonds des flasques présentent chacun centralement un logement pour le montage de la bague externe d'un roulement à billes. La bague interne des roulements à billes est traversée par l'arbre du rotor monté ainsi à rotation dans le carter comme décrit par exemple dans le document
Le rotor de ce document comporte un corps de rotor à pôles saillants portant des bobinages et des aimants permanents. L'arbre de rotor porte un collecteur à bagues électriquement conductrices pour alimentation électrique des bobinages. En outre il est prévu des balais pour frotter sur les bagues collectrices afin d'alimenter électriquement celles-ci. Les aimants sont enterrés axialement dans le paquet de tôles du corps du rotor en étant d'orientation axiale par rapport à l'axe de symétrie axiale de l'arbre de rotor.The rotor of this document comprises a protruding poles rotor body carrying coils and permanent magnets. The rotor shaft carries a collector with electrically conductive rings for powering the coils. In addition, there are provided brooms for rubbing on the slip rings in order to electrically power them. The magnets are buried axially in the bundle of laminations of the rotor body being axially oriented relative to the axis of axial symmetry of the rotor shaft.
Plus précisément le corps du rotor présente une partie magnétique en forme de paquet de tôles intercalée entre un premier flasque et un second flasque. La partie magnétique est portée par une âme centrale constituée par la périphérie interne de la partie magnétique trouée centralement pour sa liaison en rotation à l'arbre de rotor moletée pour son emmanchement à force dans l'âme centrale.More precisely, the body of the rotor has a magnetic part in the form of a pack of sheets interposed between a first flange and a second flange. The magnetic part is carried by a central core constituted by the inner periphery of the magnetic part pierced centrally for its connection in rotation to the knurled rotor shaft for its press fit into the central core.
Dans une autre solution la machine est implantée au niveau de la face arrière du moteur thermique du véhicule automobile avec la présence d'au moins un embrayage comme décrit par exemple dans les documents
Ce type de machine donne satisfaction.This type of machine gives satisfaction.
Dans le but de réduire les coûts et de simplifier la machine électrique on a proposé dans le document
- un premier flasque de support portant un premier épaulement en matière amagnétique,
- un second flasque de pression en matière amagnétique ;
- une partie magnétique intercalée entre le premier flasque et le second flasque ;
- une âme centrale portant la partie magnétique ;
- des logements radiaux ménagés dans la partie magnétique ;
- des aimants permanents montés dans les logements radiaux de la partie magnétique ;
- des moyens élastiques à action axiale portés par le second flasque pour action sur les aimants ;
- des trous alignés réalisés dans le premier épaulement, dans la partie magnétique et dans le second flasque de pression pour passage d'organes de fixation - tels que de rivets, des boulons, des vis ou des goujons- pour serrage de la partie magnétique entre le premier épaulement et le second flasque de pression ;
- des moyens élastiques à action radiale agissant entre l'âme centrale et la périphérie interne des aimants.
- a first support flange carrying a first shoulder of non-magnetic material,
- a second pressure flange of non-magnetic material;
- a magnetic part interposed between the first flange and the second flange;
- a central core carrying the magnetic part;
- radial housings in the magnetic part;
- permanent magnets mounted in the radial housings of the magnetic part;
- axial-action elastic means carried by the second flange for action on the magnets;
- aligned holes made in the first shoulder, in the magnetic portion and in the second pressure flange for passage of fasteners - such as rivets, bolts, screws or studs - for clamping the magnetic portion between the first shoulder and the second pressure flange;
- elastic means with radial action acting between the central core and the inner periphery of the magnets.
Les moyens élastiques à action axiale consistent en des pattes élastiques découpées dans le second flasque pour appui axial sur les aimants. Les moyens élastiques à action radiale sont distincts des moyens élastiques à action radiale. Ainsi les aimants sont ménagés et travaillent dans de bonnes conditions car ils sont retenus axialement et radialement, sachant que les aimants peuvent être endommagés par l'action de la force centrifuge si un mouvement radial se produit et que l'on réduit la performance de la machine si les aimants ne sont pas bien alignés axialement avec la partie magnétique du rotor.The elastic means with axial action consist of elastic tabs cut in the second flange for axial support on the magnets. The elastic means with radial action are distinct from the elastic means with radial action. Thus the magnets are arranged and work in good conditions because they are held axially and radially, knowing that the magnets can be damaged by the action of centrifugal force if radial movement occurs and that the performance of the magnet is reduced. machine if the magnets are not well aligned axially with the magnetic part of the rotor.
Grâce à ces dispositions on supprime le bobinage usuellement en cuivre du rotor de l'art antérieur, ainsi que les bagues collectrices et les balais ce qui permet de réduire les l'encombrement axial ainsi que le nombre de pièces et la masse de cuivre.
En outre on ne diminue pas les performances de la machine électrique car on augmente le nombre d'aimants permanents du fait que l'on implante ceux-ci dans les logements radiaux de la partie magnétique.Thanks to these arrangements, the copper winding of the rotor of the prior art, as well as the slip rings and the brushes, is eliminated, which makes it possible to reduce the axial size as well as the number of parts and the mass of copper.
In addition, the performance of the electrical machine is not reduced because the number of permanent magnets is increased because they are implanted in the radial housings of the magnetic part.
De plus grâce à la présence des moyens élastiques à action axiale on peut augmenter les tolérances de fabrication des aimants, lesdits moyens élastiques rattrapant les jeux axiaux. Les aimants peuvent donc être plus courts que la distance axiale séparant le deuxième flasque du premier épaulement après montage des organes de fixation.
Selon les applications on peut donc, pour un même diamètre intérieur et un même diamètre extérieur de la partie magnétique du rotor, réduire l'encombrement axial du fait que l'on peut implanter un grand nombre d'aimant. La réduction de l'encombrement axial du corps du rotor permet également de réduire la longueur axiale du corps du stator ainsi que la masse du bobinage, usuellement en cuivre, porté par le corps du stator ce qui permet également de réduire les coûts de la machine électrique tournante.
Selon d'autres applications pour un même diamètre extérieur de la partie magnétique du rotor on peut augmenter le diamètre interne du corps du rotor et donc, en se reportant aux documents
Il peut être souhaitable de simplifier encore le rotor à aimants permanents et moyens élastiques à action radiale et axiale du document
Depending on the applications, it is therefore possible, for the same inner diameter and the same outer diameter of the magnetic part of the rotor, to reduce the axial size because a large number of magnets can be implanted. Reducing the axial size of the rotor body also reduces the axial length of the stator body and the mass of the winding, usually copper, carried by the stator body which also reduces the costs of the machine rotating electric.
According to other applications for the same outer diameter of the magnetic part of the rotor, the internal diameter of the rotor body can be increased and therefore, referring to the documents
It may be desirable to further simplify the rotor with permanent magnets and elastic means with radial and axial action of the document
La présente invention a pour objet de répondre à ces souhaits.The present invention aims to meet these wishes.
Selon l'invention le corps du rotor comporte :
- une partie magnétique, telle qu'un paquet de tôles ;
- des logements radiaux ménagés dans la partie magnétique;
- des aimants permanents montés dans les logements radiaux de la partie magnétique et comportant chacun deux faces d'extrémité axiale et deux faces d'extrémité radiale ;
- une âme centrale de support de la partie magnétique ;
- des tenons ménagés dans l'âme centrale à la périphérie interne des logements ;
- des bandes de matière ceinturant les faces d'extrémité axiales et radiales des aimants ;
- chaque bande de matière comportant d'une part une première portion radiale interne dotée d'une mortaise coopérant par coopération de formes avec le tenon associé de l'âme centrale, d'une deuxième part deux deuxièmes portions d'extrémité axiale et d'une troisième part, une troisième portion radiale externe ;
- des moyens élastiques à action radiale appartenant à la première portion des bandes et prenant appui sur l'âme centrale pour solliciter la troisième portion des bandes et les aimants ceinturés par les bandes en direction de la périphérie externe des logements
- et des moyens élastiques à action axiale appartenant aux deux deuxièmes portions axiales des bandes pour action sur les faces d'extrémités axiale des aimants.
- a magnetic part, such as a pack of sheets;
- radial housings in the magnetic part;
- permanent magnets mounted in the radial housings of the magnetic part and each having two axial end faces and two radial end faces;
- a central support core of the magnetic part;
- tenons formed in the central core at the inner periphery of the dwellings;
- strips of material surrounding the axial and radial end faces of the magnets;
- each strip of material comprising on the one hand a first internal radial portion provided with a mortise cooperating by cooperation of shapes with the associated tenon of the central core, of a second part two second axial end portions and a third part, a third external radial portion;
- elastic means with radial action belonging to the first portion of the strips and resting on the central core to solicit the third portion of the strips and the magnets belted by the strips towards the outer periphery of the housings
- and axially acting elastic means belonging to the two second axial portions of the strips for action on the axial end faces of the magnets.
La solution selon l'invention est simple et économique car elle fait appel à des bandes de matière ceinturant et retenant les aimants lors du fonctionnement de la machine électrique tournante. Elle permet de créer un corps de rotor manipulable, transportable et imperdable. Plus précisément les bandes de matière sont immobilisées en rotation par coopération de forme avec les tenons ; les dites bandes intégrant les moyens élastiques à action axiale et radiale de sorte que l'on peut supprimer le deuxième flasque de l'art antérieur.
En outre les aimants travaillent dans de bonnes conditions en étant immobilisés radialement et axialement avec force et ce sans contrainte notable sur les aimants. On augmente ainsi la durée de vie de la machine et ce de manière sûre, les effets de la force centrifuge étant réduits par la présence des bandes.
De plus ces bandes de matière protègent et retiennent les aimants de sorte qu'il n'est pas nécessaire de prévoir à la périphérie externe des logements des plaquettes souples de retenue ou autre pour les aimants comme décrit dans le document
Le corps du rotor pourra être solidaire d'un flasque de transmission de mouvement ou d'un arbre de rotor.
Grâce à l'invention on diminue le nombre de pièces. On pourra fabriquer le corps du rotor dans un premier lieu et l'assembler dans un deuxième lieu ou dans le même lieu avec le flasque de transmission de mouvement ou avec un arbre de rotor.The solution according to the invention is simple and economical because it uses bands of material around and retaining the magnets during operation of the rotating electrical machine. It creates a manipulable, transportable and captive rotor body. More precisely, the strips of material are immobilized in rotation by shape cooperation with the tenons; said strips incorporating elastic means axial and radial action so that one can remove the second flange of the prior art.
In addition the magnets work in good conditions being immobilized radially and axially with force and without significant stress on the magnets. This increases the life of the machine in a safe manner, the effects of the centrifugal force being reduced by the presence of the bands.
In addition, these strips of material protect and retain the magnets so that it is not necessary to provide at the outer periphery of the housings of the flexible retaining plates or the like for the magnets as described in the document.
The rotor body may be integral with a motion transmission flange or a rotor shaft.
Thanks to the invention, the number of parts is reduced. The rotor body can be manufactured in a first place and assembled in a second place or in the same place with the motion transmission flange or with a rotor shaft.
De préférence les bandes de matière pourront être en matière amagnétique. Les bandes de matière pourront être métallique, par exemple en inox, pour diminution de l'encombrement radial et axial.Preferably the strips of material may be of non-magnetic material. The strips of material may be metallic, for example stainless steel, for reducing the radial and axial dimensions.
Suivant l'invention une machine électrique tournante- telle qu'un alternateur, un alterno-démarreur ou un moteur électrique de véhicule automobile- est caractérisée en ce qu'elle comporte un tel corps de rotor.According to the invention a rotating electrical machine such as an alternator, a starter-alternator or an electric motor vehicle motor is characterized in that it comprises such a rotor body.
Suivant d'autres caractéristiques prises isolément ou en combinaison :
- les bandes sont verrouillées à la faveur d'une connexion à moyens d'encliquetage ;
- les moyens d'encliquetage affectent la troisième portion des bandes ;
- la troisième portion des bandes comporte deux parties, l'une des parties comportant un trou tandis que l'autre partie comporte une patte inclinée destinée à pénétrer dans le trou ;
- la partie à trou de la troisième portion des bandes est moins large que celle comprenant la patte inclinée ;
- la partie à trous est moins longue que celle comportant la patte inclinée, les moyens d'encliquetage étant implanté au voisinage de l'une des extrémités de la troisième portion d'une bande ;
- les moyens élastiques à action radiale et axial d'une bande sont formés respectivement à la faveur d'une forme bombée de la première portion de la bande et à la faveur d'une forme bombée d'au moins l'une des deuxièmes portions de la bande ;
- les moyens élastiques à action axiale sont formés à la faveur d'une forme bombée de chacune des deuxièmes portions de la bande;
- la mortaise d'une bande affecte la forme bombée de la première portion de la bande de sorte que la première portion de la bande est fendue;
- la taille de la mortaise est fonction de la taille du tenon associé de l'âme centrale ;
- les formes bombées des moyens élastiques à action axiale et radiale prennent appui localement via leur sommet sur les faces en vis-à-vis d'un aimant ceinturé par la bande ;
- les moyens élastiques à action axiale sont formés à la faveur de languettes inclinées issues d'au moins l'une des deuxièmes portions d'une bande ;
- les languettes sont obtenues par découpe et pliage à partir des deuxièmes portions de la bande ;
- l'extrémité libre des languettes inclinées présente une forme bombée pour contact locale avec la face en vis-à-vis de l'aimant ;
- l'âme centrale appartient à la partie magnétique en constituant la périphérie interne de celle-ci;
- la partie magnétique est de forme annulaire et consiste en un paquet de tôles ;
- l'âme centrale appartient à un moyeu en matière amagnétique ;
- une extrémité de l'âme centrale est solidaire d'un flasque de transmission de mouvement ;
- la partie magnétique comporte une pluralité de segments en forme de bras ;
- les bras en matière magnétique sont globalement d'orientation radiale et séparés les uns des autres par des fentes ;
- les aimants permanents sont montés dans les fentes séparant deux à deux les bras et délimitant avec le moyeu des logements radiaux de montage des bandes et des aimants ;
- le flasque de transmission de mouvement est un seul tenant avec le moyeu constituant l'âme centrale ;
- le moyeu est rapporté sur le flasque de transmission de mouvement;
- le moyeu est rapporté par soudage, notamment du type laser, sur le flasque de transmission de mouvement ;
- le moyeu est rapporté par sertissage sur le flasque de transmission de mouvement ;
- le flasque de transmission de mouvement comporte à sa périphérie externe une collerette configurée pour être fixée à l'un des composants d'un embrayage ;
- la collerette est décalée axialement en direction opposée par rapport aux bras de la partie magnétique ;
- le flasque de transmission de mouvement est prolongé vers l'intérieur par un rebord de liaison en rotation à un arbre de rotor intermédiaire ;
- le rebord de fixation est troué pour sa fixation à l'aide d'organes de fixation, tels que des rivets, sur une collerette que présente l'arbre de rotor intermédiaire ;
- le rebord de fixation présente intérieurement des dents pour sa liaison à cannelures avec l'arbre de rotor intermédiaire ;
- l'âme centrale est configurée pour être liée en rotation à l'arbre de rotor, tel qu'un arbre menant ou mené par exemple l'arbre d'entrée de la boîte de vitesse du véhicule automobile ;
- les bras consistent en un empilement de bras élémentaires en tôle ;
- chaque bras présente à sa périphérie externe des rebords circonférentiels, tels que des lèvres, s'étendant de part et d'autre du bras ;
- une liaison mécanique intervient entre la périphérie interne des bras et le moyeu ;
- la liaison mécanique consiste en un serrage de la périphérie interne des bras sur la périphérie externe du moyeu :
- la liaison mécanique consiste en un emmanchement à force des bras sur le moyeu :
- la liaison mécanique est une liaison à coopérations de formes ;
- la liaison mécaniques est une liaison à cannelures ;
- la liaison mécanique est une liaison du type tenon mortaise ;
- la liaison mécanique est une liaison à que d'aronde ;
- les fentes, présentes entre deux bras adjacents, comportent en dessous des rebords circonférentiels, des faces parallèles pour formation avec la périphérie externe du moyeu de logements radiaux de montage des aimants ;
- les aimants ont une section globalement rectangulaire ;
- les aimants sont en ferrite ;
- les aimants sont en terre rare, tels que des aimants en Néodyme-fer-Bore (NdfeB) ou des aimants à base de Samarium Cobalt (SmCo) ;
- les aimants en ferrite appartiennent à des ensembles magnétiques comportant également au moins une partie amagnétique et /ou au moins un autre aimant ;
- le moyeu est en inox ;
- les bandes de matière sont en inox ;
- le flasque de transmission de mouvement et le moyeu sont en aluminium ou en un alliage d'aluminium ;
- le flasque de transmission de mouvement et le moyeu sont en fonte.
- the strips are locked by means of a connection with locking means;
- the latching means affect the third portion of the strips;
- the third portion of the strips has two parts, one of the parts having a hole while the other portion has an inclined tab for penetrating the hole;
- the hole portion of the third portion of the strips is narrower than that including the inclined leg;
- the hole portion is shorter than that comprising the inclined lug, the latching means being implanted in the vicinity of one end of the third portion of a strip;
- the elastic means with radial and axial action of a strip are respectively formed by means of a convex shape of the first portion of the strip and by means of a convex shape of at least one of the second portions of the band ;
- the axial-action elastic means are formed by means of a convex shape of each of the second portions of the strip;
- the mortise of a band affects the convex shape of the first portion of the band so that the first portion of the band is slotted;
- the size of the mortise is a function of the size of the associated tenon of the central soul;
- the curved forms of the elastic means with axial and radial action support locally via their top on the faces vis-à-vis a magnet belted by the band;
- the axial-action elastic means are formed by means of inclined tabs coming from at least one of the second portions of a strip;
- the tongues are obtained by cutting and folding from the second portions of the strip;
- the free end of the inclined tongues has a curved shape for local contact with the face vis-à-vis the magnet;
- the central core belongs to the magnetic part constituting the inner periphery thereof;
- the magnetic portion is annular in shape and consists of a pack of sheets;
- the central core belongs to a hub made of non-magnetic material;
- an end of the central core is integral with a motion transmission flange;
- the magnetic part comprises a plurality of arm-shaped segments;
- the arms of magnetic material are generally of radial orientation and separated from each other by slots;
- the permanent magnets are mounted in the slots separating the arms in pairs and delimiting with the hub radial mounting housing bands and magnets;
- the motion transmission flange is a single piece with the hub constituting the central core;
- the hub is attached to the motion transmission flange;
- the hub is attached by welding, in particular of the laser type, on the motion transmission flange;
- the hub is crimped onto the motion transmission flange;
- the motion transmission flange has at its outer periphery a flange configured to be attached to one of the components of a clutch;
- the flange is axially offset in the opposite direction relative to the arms of the magnetic part;
- the motion transmission flange is extended inwardly by a rotational connection flange to an intermediate rotor shaft;
- the fixing flange is pierced for fixing with fasteners, such as rivets, on a flange that has the intermediate rotor shaft;
- the fixing flange internally has teeth for its spline connection with the intermediate rotor shaft;
- the central core is configured to be rotatably connected to the rotor shaft, such that a driving or driven shaft for example the input shaft of the gearbox of the motor vehicle;
- the arms consist of a stack of elementary arms made of sheet metal;
- each arm has at its outer periphery circumferential rims, such as lips, extending on either side of the arm;
- a mechanical connection occurs between the inner periphery of the arms and the hub;
- the mechanical connection consists of a tightening of the inner periphery of the arms on the outer periphery of the hub:
- the mechanical connection consists of a press fit of the arms on the hub:
- the mechanical connection is a connection with shaped cooperation;
- the mechanical connection is a splined connection;
- the mechanical connection is a mortise type connection;
- the mechanical connection is a connection to that of dovetail;
- the slots, present between two adjacent arms, have, below the circumferential flanges, parallel faces for formation with the outer periphery of the hub of radial housings for mounting the magnets;
- the magnets have a generally rectangular section;
- the magnets are made of ferrite;
- the magnets are rare earth, such as neodymium-iron-boron magnets (NdfeB) or Samarium Cobalt-based magnets (SmCo);
- the ferrite magnets belong to magnetic assemblies also comprising at least one non-magnetic part and / or at least one other magnet;
- the hub is made of stainless steel;
- the strips of material are made of stainless steel;
- the motion transmission flange and the hub are made of aluminum or an aluminum alloy;
- the motion transmission flange and the hub are cast iron.
On appréciera que les moyens élastiques à action radiale facilitent le montage des aimants ceinturés par les bandes, les moyens élastiques à action radiale étant déformés lors du montage des aimants dans les logements.It will be appreciated that the elastic means with radial action facilitate the mounting of the magnets belted by the strips, the elastic means with radial action being deformed during assembly of the magnets in the housings.
On appréciera que les moyens élastiques à action radiale et axiale facilitent l'encliquetage des moyens des moyens d'encliquetage intervenant au niveau de la troisième portion des bandes, du fait que l'on peut déformer lesdits moyens élastiques.It will be appreciated that the elastic means with radial and axial action facilitate the latching of the means of the latching means intervening at the level of the third portion of the strips, since it is possible to deform said elastic means.
D'autres avantages apparaîtront à la lecture de la description qui va suivre de manière non limitative et ce en regard des dessins annexésOther advantages will appear on reading the following description in a nonlimiting manner and with reference to the accompanying drawings.
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figure 1 est une vue en perspective partielle d'un corps de rotor de machine électrique tournante montrant pour plus de clarté qu'un seul aimants permanent ceinturé par une bande à moyens élastiques à action radiale et axiale pour un premier mode de réalisation selon l'invention;thefigure 1 is a partial perspective view of a rotary electric machine rotor body showing for clarity only one permanent magnet surrounded by a band with elastic means with radial and axial action for a first embodiment according to the invention; -
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figure 2 est une vue en perspective de la bande de lafigure 1 ;thefigure 2 is a perspective view of the band from thefigure 1 ; -
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figure 3 est une vue en perspective de l'aimant permanent de lafigure 1 destiné à être ceinturé par la bande de lafigure 2 pour sa retenue ;thefigure 3 is a perspective view of the permanent magnet of thefigure 1 intended to be belted by the band of thefigure 2 for his restraint; -
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figure 4 est une vue en coupe axiale de l'aimant permanent monté dans sa bande de ceinture elle-même montée par coopération de formes dans l'âme centrale de lafigure 1 ;thefigure 4 is an axial sectional view of the permanent magnet mounted in its belt band itself mounted by cooperation of shapes in the central core of thefigure 1 ; -
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figure 5 est une vue partielle de dessus de la troisième portion de la bande de retenue elle-même implantée à la périphérie externe fendue de la partie magnétique de lafigure 1 .thefigure 5 is a partial view from above of the third portion of the retaining band itself implanted at the split outer periphery of the magnetic part of thefigure 1 .
Dans les figures les éléments identiques ou similaires seront affectés des mêmes signes de référence.In the figures, identical or similar elements will be assigned the same reference signs.
Dans les figures représentées le corps de rotor 1 d'une machine électrique tournante est, pour réductions des coûts et de l'encombrement axial, dépourvu de bobinage et donc de bagues collectrices et de balais ce qui permet également de réduire le nombre de pièces et de simplifier le corps du rotor. Ce corps comporte des aimants permanents 20 montés dans des logements radiaux 3 que présente le corps 1. Par simplicité et pour plus de clarté, on n'a représenté que l'un des aimants monté dans l'un des logements 3, décrits ci-après. Bien entendu une pluralité d'aimants est montée dans les logements 3. De préférence tous les logements radiaux 3 sont occupés par un aimant permanent pour avoir une machine électrique de grande puissance. En variante certains logements 3 peuvent être vides.
Le corps 1 est de forme annulaire. Pour mémoire on rappellera qu'un entrefer existe entre la périphérie externe du corps 1 et la périphérie interne du corps du stator visible dans les documents précités. Le corps 1 présente centralement un axe de symétrie axiale X (
Par matière magnétique on entend une matière apte à transmettre un flux magnétique, telle que de la matière ferromagnétique par exemple un paquet de tôles. Une matière amagnétique, telle que de l'inox, l'aluminium, de la matière plastique ou du laiton, par opposition à un matériau magnétique, est un mauvais conducteur de flux magnétique. Cette matière amagnétique pourra même empêcher toute transmission du flux magnétique. Elle réduit, voir élimine, les fuites magnétiques.In the figures shown, the rotor body 1 of a rotating electrical machine is, for cost and axial size reductions, without winding and thus with slip rings and brushes, which also makes it possible to reduce the number of parts and to simplify the rotor body. This body comprises
The body 1 is annular. For the record it will be recalled that an air gap exists between the outer periphery of the body 1 and the inner periphery of the body of the stator visible in the aforementioned documents. The body 1 has centrally an axis of axial symmetry X (
By magnetic material is meant a material capable of transmitting a magnetic flux, such as ferromagnetic material, for example a pack of sheets. A non-magnetic material, such as stainless steel, aluminum, plastic or brass, as opposed to a magnetic material, is a poor magnetic flux conductor. This non-magnetic material can even prevent any transmission of the magnetic flux. It reduces or eliminates magnetic leakage.
La partie magnétique 4 comporte des logements radiaux 3 pour des aimants permanents notamment 20 en ferrite ou en terre rare, tels que des aimants en Néodyme-fer-Bore (NdfeB) ou des aimants à base de Samarium Cobalt (SmCo).
La partie magnétique 4 pourra être de forme annulaire et consister en un paquet de tôles comme visible à la
L'âme 100 pourra appartenir à la partie magnétique en constituant la périphérie interne continue de celle-ci comme visible à la
En variante l'âme pourra être constituée par un moyeu ou un arbre de rotor de préférence en matière amagnétique ou faiblement magnétique, portant la partie magnétique. Cette âme pourra être de forme annulaire.
Le corps 1 du rotor pourra être solidaire d'un flasque d'extrémité de transmission de mouvement, qui pourra être configuré pour être lié en rotation à un arbre de rotor comme décrit par exemple dans le document
Le rotor comporte un paquet de tôles porté par un moyeu solidaire d'un flasque constituant le plateau de réaction du deuxième embrayage.
Ce flasque de transmission de mouvement, à la lumière de ce document, pourra comporter un rebord interne pour sa liaison en rotation à une collerette que présente l'arbre de rotor intermédiaire.
En variante, comme décrit dans le document
Par simplicité on n'a pas représenté ici le flasque visible dans ces deux documents
En variante le corps du rotor pourra être lié en rotation à l'arbre de rotor via son moyeu constituant l'âme centrale du corps du rotor.
Pour ce faire dans les deux cas l'arbre de rotor pourra être moleté pour son emmanchement à force dans l'alésage central de l'âme. L'arbre de rotor pourra être en matière amagnétique ou faiblement magnétique.
Pour rattraper les tolérances axiales de fabrication des aimants et ménager ceux-ci, on fait appel à des moyens élastiques à action axiale portés par une bande de matière 10 associée à chaque aimants 20 et ceinturant l'aimant associé. Les bandes 10 et leurs aimants 20 sont montées dans les logements 3. Chaque bande 10 constitue une bande de retenue de l'aimant 20, de manière décrite ci-après, et est configurée pour constituer des moyens élastiques à action radiale protégeant les aimants soumis à l'action de la force centrifuge de sorte qu'aucun élément de retenu, tel que des plaquettes ou autre n'est à prévoir. Les bandes 10 s'opposent aux mouvements axial et radial des aimants
Des moyens de blocage en rotation interviennent entre l'âme 4 et les bandes 10. La bande de matière 10 pourra être en matériau amagnétique Elle pourra être métallique pour réduction de son encombrement axial et radial. Cette bande 10 pourra être en inox.The
The
The
In a variant, the core may be constituted by a hub or a rotor shaft, preferably of non-magnetic or slightly magnetic material, bearing the magnetic part. This soul may be ring-shaped.
The body 1 of the rotor may be integral with a flange end of motion transmission, which may be configured to be rotatably connected to a rotor shaft as described for example in the document
The rotor comprises a pack of plates carried by a hub integral with a flange constituting the reaction plate of the second clutch.
This flange of motion transmission, in the light of this document, may include an internal flange for its connection in rotation to a flange that has the intermediate rotor shaft.
Alternatively, as described in the document
For simplicity, the flask visible in these two documents is not represented here.
Alternatively the rotor body may be rotatably connected to the rotor shaft via its hub constituting the central core of the rotor body.
To do this in both cases the rotor shaft can be knurled for its press fitting into the central bore of the core. The rotor shaft may be non-magnetic or slightly magnetic material.
In order to make up the axial tolerances for the manufacture of the magnets and to protect them, elastic means with axial action are used carried by a strip of
Rotation locking means intervene between the
Plus précisément le corps du rotor 1 comporte :
- une partie magnétique 4, telle qu'un paquet de tôles ;
- des logements radiaux 3 ménagés dans la partie magnétique 4;
- des aimants permanents 20 montés dans les logements radiaux 3 et comportant chacun deux faces d'extrémité axiale 23 et deux faces
21,24;d'extrémité radiale - une âme centrale 100 de support de la partie magnétique ;
- des tenons 2 ménagés dans l'âme 100 à la périphérie interne des logements 3 ;
- des bandes de matière 10 ceinturant les faces d'extrémité axiales 13 et radiales 21, 24 des aimants 20 ;
- chaque bande 10 comportant, d'une part une première
portion radiale interne 11 dotée d'une mortaise 12 coopérant par coopération de formes avec le tenon 2 associé de l'âme 100, d'une deuxième part, deux deuxièmes portions d'extrémité axiale 13 et d'une troisième part, une troisièmeportion radiale externe 14 ; - des moyens élastiques à action radiale 16 appartenant à la première
portion 11 des bandes et prenant appui sur l'âme centrale 100 pour solliciter la troisièmeportion 14 des bandes et les aimants 20 ceinturés par les bandes 10 en direction de la périphérie externe des logements 3. - et des moyens élastiques à action axiale 16' appartenant aux deux deuxièmes
portions 13 des bandes pour action sur les faces d'extrémités axiale 23 des aimants ;
- a
magnetic part 4, such as a pack of sheets; - radial housings 3 formed in the
magnetic part 4; -
permanent magnets 20 mounted in the radial housings 3 and each having two axial end faces 23 and two radial end faces 21,24; - a
central core 100 for supporting the magnetic part; - studs 2 formed in the
core 100 at the inner periphery of the housing 3; - strips of
material 10 surrounding the axial end faces 13 and radial 21, 24 of themagnets 20; - each
strip 10 comprising, on the one hand, a first internalradial portion 11 provided with amortise 12 cooperating in shape cooperation with the associated pin 2 of thecore 100, a second portion, two second axial end portions, 13 and a third part, a third outerradial portion 14; - resilient means with
radial action 16 belonging to thefirst portion 11 of the strips and resting on thecentral core 100 to urge thethird portion 14 of the strips and themagnets 20 belted by thestrips 10 towards the outer periphery of the housings 3 . - and axially acting elastic means 16 'belonging to the two
second portions 13 of the strips for action on the axial end faces 23 of the magnets;
Plus précisément, comme visible dans les figures les moyens élastiques à action radiale 16 appartiennent à la première portion 11 d'une bande 10 et prennent appui sur l'âme centrale 100 et sur la face radiale interne 21 de l'aimant associé 20 pour solliciter la troisième portion 14 de la bande 10 et la face radiale externe 24 de l'aimant associé 20 en direction de la périphérie externe du logement 3 concerné. Les tenons 2 et les mortaises 12 constituent de manière simple et économique des moyens de blocage en rotation. Les tenons 2 sont implantés dans les figures centralement à la périphérie interne des logements 3. Les aimants 20 présentent en outre deux faces latérales en regard de deux bras consécutifs 4 que présente la partie magnétique 4 de manière décrite ci-dessous.
Les moyens élastiques à action axiale 16' et radiale 16 exercent une force de maintien sur les aimants lorsque la machine électrique tourne et ce sans exercer de contrainte notable sur les aimants. La largeur et l'épaisseur des bandes des bandes sont sélectionnées pour exercer sur les faces de l'aimant la force de maintien nécessaire dans toutes les circonstances durant la rotation de la machine. La largeur des bandes est inférieure ou égale au jeu de montage près à celle des logements 3. Il en est de même de la hauteur des bandes qui est inférieure ou égale au jeu de montage près à celle des logements, cette hauteur correspondant à celle des première 11 et troisième 14 portions des bandes. La longueur des bandes, correspondante à celles des deuxièmes portions 13, est fonction de la longueur des logements.More precisely, as can be seen in the figures, the elastic means with
The elastic means 16 'axial and
La partie magnétique 4 du corps 1 comporte une pluralité de bras radiaux 4 élémentaires en matière magnétique solidaires de l'âme centrale 100, qui comporte elle-même une pluralité d'âme élémentaires 100 dotées chacune de tenons 2. L'âme 100 pourra être cylindrique et être assemblée, de manière précitée, avec un arbre de rotor amagnétique, par exemple moleté pour son montage à force dans l'alésage interne cylindrique de l'âme 100. Les bras 4 sont répartis circonférentiellement de manière régulière en étant séparés les uns des autres par des fentes. Ils appartiennent chacun à une pluralité de rondelles comprenant chacune une âme centrale élémentaire à tenons 2 et des bras élémentaires 4 en tôle Ces rondelles en tôle sont empilées les uns sur les autres pour formation du corps 1 et réduction des courants de Foucault. Ces tôles sont en matière ferromagnétique avec éventuellement un revêtement. Les tôles ont une faible épaisseur par exemple de 0,3 à 0,35 mm
La périphérie externe des bras 4 délimite l'entrefer avec la périphérie interne du corps du stator de la machine électrique tournante.
Les bras 4, en forme de secteur annulaire, sont dotés chacun à leur périphérie externe de prolongements circonférentiels 5 s'étendant de part et d'autre de chaque bras 4. Les prolongements 5 limitent les fuites magnétiques entre deux bras adjacents, un jeu existant entre les prolongements 5, dirigés l'un vers l'autre, de deux bras adjacents. Le corps 1 du rotor est donc ouvert à sa périphérie externe et les fentes entre deux bras adjacents ont une largeur réduite à la périphérie externe des bras au niveau des prolongements 5. Ces prolongements sont ici en forme de lèvres 5 et délimitent la périphérie externe des logements 3. De même l'âme centrale délimite la périphérie interne des logements radiaux 3 de sorte que ceux-ci sont des logements borgnes. Les tenons 2 s'étendent en saillie radiale à la périphérie externe de l'âme 100 et ce centralement par rapport à la périphérie interne des logements 3 constituant le fond des logements 3.
Radialement en dessous des lèvres 5, les faces latérales (non référencées) en vis-à-vis de deux bras radiaux 4 sont dans ces modes de réalisations parallèles puis convergentes en direction de la périphérie interne des logements 3 délimitée par l'âme centrale 100 (Voir
The outer periphery of the
The
Radially below the lips 5, the lateral faces (not referenced) vis-à-vis two
Les logements 3 servent de manière précitée au montage et au logement des bandes 10 et des aimants 20 associés ceinturés par les bandes 10. Les aimants permanents 20 pourront être en ferrite. Ces aimants 20 résistent bien à la force centrifuge et sont économiques.
Les aimants 20 ont ici une forme globalement parallélépipédique. La section des aimants 20 est dans une réalisation de forme rectangulaire ou carrée. Dans ce mode de réalisation, comme visible à la
Le nombre d'aimants 20 et de bras dépend des applications.
De préférence le nombre des bras 4, de logements 3 et d'aimants 20 est égal au moins à 10. Les logements 3 borgnes sont délimités intérieurement par la périphérie externe de l'âme 100.
Grâce à ces dispositions on obtient une machine électrique tournante compacte axialement et puissante et ce de manière simple et économique.The housings 3 serve as aforesaid for mounting and
The
The number of
Preferably the number of the
Thanks to these arrangements we obtain a rotating electrical machine compact axially and powerful in a simple and economical way.
Les bras 4 pourrons présenter avantageusement chacun un trou pour le passage d'organes de fixation, qui pourront être en matière magnétique ou en matière amagnétique. Les organes de fixation pourront être métalliques et pourront consister en des vis, telles que des tirants, des rivets des goujons ou des boulons. Ainsi le corps 1 aura une épaisseur constante et le paquet de tôles pourra consister en un ensemble manipulable et transportable à la faveur d'organes de fixation supplémentaires, de préférence en matière amagnétique, traversant des trous alignés supplémentaires réalisés dans le paquet de tôles.
Des flasques en matière amagnétique, telle que de l'aluminium, pourront être disposés de part et d'autre du paquet de tôles 4, 100 comme dans le document
Flanges of non-magnetic material, such as aluminum, may be placed on either side of the
Bien entendu en variante les logements radiaux 3 pourront être dépourvus de fentes et donc fermés à leur périphérie externe.
Les logements 3 pourront donc être délimités intérieurement par la périphérie externe de l'âme centrale et extérieurement par la périphérie externe de la partie magnétique.
En référence aux
Dans cette réalisation les moyens élastiques à action radiale 16, 16'et axial d'une bande sont formés respectivement à la faveur d'une forme bombée de la première portion 11 de la bande et à la faveur d'une forme bombée d'au moins l'une des deuxièmes portions 13 de la bande.Of course, in a variant, the radial housings 3 may be devoid of slots and thus closed at their outer periphery.
The housings 3 may therefore be delimited internally by the outer periphery of the central core and externally by the outer periphery of the magnetic part.
With reference to
In this embodiment the elastic means with
Avantageusement les moyens élastiques à action axiale 16' sont formés à la faveur d'une forme bombée de chacune des deuxièmes portions 13 de la bande.
La mortaise 12 d'une bande affecte la forme bombée de la première portion 11 de la bande de sorte que la première portion de la bande est fendue (Voir
On notera que les formes bombées sont formées à la faveur de plis (Voir
Il ressort de la description et des figures que les formes bombées des moyens élastiques à action axiale 16' et radiale 16 prennent appui localement via leur sommet sur les faces en vis-à-vis d'un aimant ceinturé par la bande. Lors du montage des aimants 20 dans leur logement 20 on déforme les moyens élastiques à action radiale 16. Les moyens élastiques 16, 16' facilitent le verrouillage des moyens d'encliquetage 15 du fait qu'ils peuvent être déformés. Lors du montage de la bande 10 autour des aimants on comprime les moyens élastiques 16, 16' pour introduire les pattes inclinées dans leur trou associé. Ensuite on relâche la pression exercée sur les moyens élastiques pour verrouiller les pattes dans leur trou.
Après montage des aimants et des bandes, les bandes 10 sont admise à coopérer avec les lèvres 5 sous l'action des moyens élastiques à action radiale 16. Les bandes protègent ainsi les aimants 20
Les tenons 2 et les mortaises 12 bloquent en rotation les bandes 10, les moyens élastiques à action radiale 16 étant déformés pour l'engagement des mortaises 12 dans les tenons 2. Les moyens élastiques à action axiale 16' bloquent par la suite les aimants 20, qui sont ainsi retenus.
On notera que le jeu entre deux lèvres 5 dirigées l'une vers l'autre est égal -au jeu de montage près- ou supérieur à la largeur des moyens d'encliquetage 15.Advantageously, the axial-action elastic means 16 'are formed by means of a convex shape of each of the
The
It will be noted that the curved forms are formed by means of folds (see
It is apparent from the description and figures that the curved shapes of the elastic means 16 'axial and
After assembling the magnets and strips, the
The tenons 2 and the
It should be noted that the clearance between two lips 5 directed towards each other is equal to the mounting clearance near or greater than the width of the latching means 15.
Dans ce mode de réalisation les moyens élastiques à action radiale 16 sont conservés. Ce second mode de réalisation se distingue du premier mode de réalisation par le fait que les moyens élastiques à action axiale sont modifiés.In this embodiment, the elastic means with
Ces moyens élastiques à action axiale 16' sont formés à la faveur de languettes inclinées issues d'au moins l'une des deuxièmes portions 13 d'une bande. Les languettes sont saillantes en direction des faces associées des aimants 20. L'autre deuxième portion 13 pourra être dotée également d'une languette inclinée. En variante l'autre portion pourra avoir une forme bombée comme dans le premier mode de réalisation0These elastic means with axial action 16 'are formed in favor of inclined tongues from at least one of the
Les languettes pourront être obtenues par découpe et pliage à partir des deuxièmes portions de la bande.The tongues may be obtained by cutting and folding from the second portions of the strip.
L'extrémité libre des languettes inclinées présente une forme bombée pour contact locale avec la face en vis-à-vis de l'aimant 20 associé.The free end of the inclined tongues has a curved shape for local contact with the face vis-à-vis the associated
Dans cette forme de réalisation l'âme centrale 100 consiste en un moyeu ou manchon en matière amagnétique et les bras 4 de la partie magnétique sont rapportés sur ce moyeu. Une liaison mécanique pourra intervenir entre la périphérie interne des bras et le moyeu. La liaison mécanique pourra consister en un serrage de la périphérie interne des bras sur la périphérie externe du moyeu.In this embodiment, the
En variante la liaison mécanique pourra consister en un emmanchement à force des bras sur le moyeu, ou en une liaison à coopérations de formes.As a variant, the mechanical connection may consist of a press fit of the arms on the hub, or a connection with shaped co-operation.
La liaison mécanique pourra consister en une liaison à cannelures, ou en une liaison du type tenon mortaises, ou en une liaison à queue d'aronde. Dans ce mode de réalisation les tenons sont d'un seul tenant avec le moyeu ou le manchon et on rapporte les bras 4 sur le moyeu ou le manchon. Les bandes 10 pourront avoir la forme de celle du premier ou du second mode de réalisation.The mechanical connection may consist of a splined connection, or a tenon type mortise connection, or a dovetail connection. In this embodiment, the tenons are integral with the hub or the sleeve and the
Comme dans le premier mode de réalisation les bras en matière magnétique sont globalement d'orientation radiale et séparés les uns des autres par des fentes.As in the first embodiment, the arms of magnetic material are generally of radial orientation and separated from one another by slots.
Les aimants permanents et les bandes 10 sont montés dans les fentes séparant deux à deux les bras 4 et délimitant avec le moyeu des logements radiaux de montage des aimants.The permanent magnets and the
Une extrémité de l'âme centrale pourra être solidaire d'un flasque de transmission de mouvement comme décrit dans les documents
Ainsi le flasque de transmission de mouvement pourra être d'un seul tenant avec le moyeu constituant l'âme centrale.Thus the movement transmission flange may be in one piece with the hub constituting the central core.
Le moyeu pourra être rapporté sur le flasque de transmission de mouvement;The hub may be attached to the motion transmission flange;
Le moyeu pourra être rapporté par soudage, notamment du type laser, ou sertissage sur le flasque de transmission de mouvement.The hub may be attached by welding, in particular of the laser type, or crimping on the motion transmission flange.
Le flasque de transmission de mouvement, comme dans les documents précités, pourra comporter à sa périphérie externe une collerette configurée pour être fixée à l'un des composants d'un embrayage.The flange of motion transmission, as in the aforementioned documents, may comprise at its outer periphery a flange configured to be attached to one of the components of a clutch.
La collerette pourra être décalée axialement en direction opposée par rapport aux bras de la partie magnétique ;The flange may be axially offset in the opposite direction relative to the arms of the magnetic part;
Le flasque de transmission de mouvement pourra être prolongé vers l'intérieur par un rebord de liaison en rotation à un arbre de rotor intermédiaire ;The motion transmission flange may be extended inward by a rotational connection flange to an intermediate rotor shaft;
Le rebord de fixation pourra être troué pour sa fixation à l'aide d'organes de fixation, tels que des rivets, sur une collerette que présente l'arbre de rotor intermédiaire ;The fixing flange may be perforated for fixing with fasteners, such as rivets, on a flange that has the intermediate rotor shaft;
Le rebord de fixation pourra présenter intérieurement des dents pour sa liaison à cannelures avec l'arbre de rotor intermédiaire.The mounting flange may have teeth for its spline connection with the intermediate rotor shaft.
Ainsi qu'il ressort de ce qui précède le corps 1 se monte en lieu et place de celui des documents
Dans tous les cas on peut augmenter le diamètre du dispositif de débrayage et le diamètre du palier ce qui permet d'augmenter la durée de vie de la machine électrique tournante.In any case it is possible to increase the diameter of the disengaging device and the diameter of the bearing, which makes it possible to increase the service life of the rotating electrical machine.
En variante le moyeu en matière amagnétique pourra être relié à un arbre de rotor par exemple par emmanchement à force de portions moletés de l'arbre dans l'alésage interne du moyeu. On pourra prévoir des organes de fixation, comme dans le premier mode de réalisation, traversant les bras 4 et assemblées avec un flasque solidaire du moyeu, le montage des bras sur le moyeu étant réalisé de manière décrite ci-dessus.As a variant, the hub made of non-magnetic material may be connected to a rotor shaft, for example by force-fitting knurled portions of the shaft into the internal bore of the hub. Fixing members may be provided, as in the first embodiment, passing through the
Dans les figures le rayon de la périphérie externe des bras 4 n'est pas constant pour diminution des bruits magnétiques et des vibrations. En variante le rayon de la périphérie externe des bras 4 est constant ainsi que l'entrefer entre le stator et le rotor de la machine électrique tournante.In the figures, the radius of the outer periphery of the
Dans les figures les prolongements 5 en forme de lèvres constituent des épaulements pour les bandes de retenue 10 des aimants 20 et délimitent la largeur réduite des fentes étagées en largeur circonférentielle du fait de la présence d'un jeu entre les lèvres 5 de deux bras consécutifs. On notera que la largeur de ce jeu (voir
En variantes les logements pourront être de largeur constante.
En variante les aimants appartiennent à un ensemble magnétique comportant un aimant et au moins une partie en matière amagnétique fixée, par exemple par collage, sur la périphérie interne de l'aimant ainsi de hauteur radiale réduite. Dans ce cas les moyens élastiques à action radiale agissent vi les bandes sur la portion amagnétique.In the figures the lip-shaped extensions 5 constitute shoulders for the retaining strips 10 of the
In variants the dwellings may be of constant width.
Alternatively the magnets belong to a magnetic assembly comprising a magnet and at least a portion of non-magnetic material fixed, for example by gluing, on the inner periphery of the magnet and of reduced radial height. In this case the elastic means with radial action act vi the strips on the nonmagnetic portion.
En variante les aimants 20 appartiennent à un ensemble magnétique comportant deux aimants réunis par collage. Ces aimants pourront ne pas être de même nature, l'un étant par exemple en ferrite et l'autre en terre rare. Bien entendu toutes les combinaisons sont possibles. Ainsi l'ensemble magnétique pourra comporter au moins un aimant en ferrite, un autre aimant et au moins une partie en matière amagnétique.
Dans une autre forme de réalisation plus coûteuse les aimants sont en terre rare, par exemple en Néodyme-Fer-Bore.
Grâce aux ensembles magnétiques on peut standardiser les aimants et en fonction des applications et de la taille des logements 3.Alternatively the
In another more expensive embodiment the magnets are rare earth, for example neodymium-iron-boron.
Thanks to magnetic assemblies magnets can be standardized and according to the applications and the size of the housings 3.
Dans un mode de réalisation on peut fixer, par exemple par collage, une cible magnétique, avantageusement dotée de pôles Nord et Sud, pour suivre la rotation du rotor de la machine électrique tournante, dont le carter est doté d'un porte capteur par exemple à effet Hall associé à la cible magnétique comme décrit dans le document
La machine électrique tournante à corps 1 de rotor pourra être équipée d'un pont redresseur de courant alternatif en courant continu visible partiellement dans le document
La machine électrique tournante à corps de rotor 1 pourra être dotée d'un onduleur comme décrit par exemple dans le document
Dans ce cas elle pourra consister en un alterno-démarreur comme dans les documents
En variante on peut modifier l' alterno-démarreur de ce document
In this case it may consist of an alternator-starter as in the documents
In a variant, the alternator / starter of this document can be modified
Bien entendu la présence du premier embrayage associé au vilebrequin du véhicule n'est pas obligatoire, l'arbre intermédiaire étant alors une prolongation du nez du vilebrequin du véhicule. Dans ce document le carter portant le stator pourra être refroidit par une circulation de fluide, tel que le fluide de refroidissement du véhicule.Of course the presence of the first clutch associated with the crankshaft of the vehicle is not mandatory, the intermediate shaft then being an extension of the nose of the crankshaft of the vehicle. In this document, the casing carrying the stator may be cooled by a circulation of fluid, such as the cooling fluid of the vehicle.
Cet alterno-démarreur pourra appartenir à un prolongateur d'autonomie d'un véhicule électrique, le dit prolongateur comportant un moteur thermique associé à l'alterno-démarreur pour former un groupe électrogène afin de recharger les batteries du véhicule électrique.This alternator-starter may belong to a range extender of an electric vehicle, said extension comprising a heat engine associated with the alternator-starter to form a generator to recharge the batteries of the electric vehicle.
L' alterno-démarreur pourra être entraîné en rotation par le moteur thermique du véhicule automobile via un dispositif de transmission à au moins une courroie et donc tourner plus vite ce qui est rendu possible grâce aux bandes 10.The alternator / starter may be rotated by the engine of the motor vehicle via a transmission device to at least one belt and thus turn faster which is made possible thanks to the
Bien entendu avec un onduleur la machine électrique tournante à corps de rotor 1 pourra être un moteur électrique, tel qu'un moteur électrique d'un compresseur de climatisation par exemple du type « scroll » décrit dans le document
Il ressort de ce qui précède que la machine électrique tournante, telle qu'un alternateur, un alterno-démarreur ou un moteur électrique de véhicule automobile, est avantageusement du type polyphasé, par exemple du type triphasé, pentaphasé ou hexaphasé.It follows from the foregoing that the rotating electrical machine, such as an alternator, a starter-alternator or a motor vehicle electric motor, is advantageously of the polyphase type, for example of the three-phase, pentaphase or hexaphase type.
Le stator de la machine électrique tournante pourra comporter, de manière connue, un corps de stator doté de dents notamment pour montage de bobines concentriques. Ce corps de stator pourra comporter un nombre de dents supérieur au nombre d'aimants, par exemple 72 dents pour 24 bras 4. La longueur axiale du corps du stator pourra être inférieure à la longueur axiale des bras 4. Avantageusement le nombre de bras 4 est égal au moins à 10.
En variante le corps du stator pourra porter un bobinage du type ondulé formé à partir de fils conducteurs continus ou en forme de segments conducteurs comme décrit par exemple dans le document
As a variant, the stator body may carry a corrugated type winding formed from continuous conductor wires or in the form of conductive segments, as described for example in the document
La présente invention permet de réduire le volume des aimants de l'ordre de 35 à 40% ainsi que les fuites de flux magnétique du fait notamment que le moyeu est en matière amagnétique. Cela permet également de réduire les coûts, le poids du rotor et d'augmenter le diamètre interne. On pourra ne pas utiliser des aimants en terre rare, de simples aimants en ferrite étant suffisants. Le rotor à bras rapportés résiste bien à l'action de la force centrifuge.The present invention makes it possible to reduce the volume of the magnets of the order of 35 to 40% as well as magnetic flux leakages, in particular because the hub is made of non-magnetic material. It also reduces costs, rotor weight and increases the internal diameter. It may not be possible to use rare earth magnets, simple ferrite magnets being sufficient. The rotor with arms reported resists the action of the centrifugal force.
De manière précitée on appréciera que les bras segmentés 4 en combinaison avec le moyeu mauvais conducteur de flux magnétique permettent de réduire les fuites magnétiques et donc la masse du rotor. La masse de fer due à la présence des bras 4 est également réduite ce qui permet de diminuer le prix de la machine électrique.As mentioned above, it will be appreciated that the
Claims (18)
- Rotor body (1) including:- a magnetic part (4), such as a stack of laminations;- radial recesses (3) formed in the magnetic part (4) ;- permanent magnets (20) mounted in the radial recesses (3) and each including two axial end faces (23) and two radial end faces (21, 24);- a central core (100) for supporting the magnetic part;characterized in that it includes- tenons (2) formed in the core (100) at the inner periphery of the recesses (3);- strips of material (10) surrounding the axial (13) and radial (21, 24) end faces of the magnets (20);- each strip (10) including firstly a first inner radial potion (11) provided with a mortise (12) interacting in a form-fitting manner with the tenon (2) associated with the core (100), secondly, two second axial end portions (13) and, thirdly, a third outer radial portion (14);- flexible radial action means (16) belonging to the first portion (11) of the strips and bearing on the central core (100) so as to urge the third portion (14) of the strips and the magnets (20) surrounded by the strips (10) in the direction of the outer periphery of the recesses (3);- and flexible axial action means (16') belonging to the two second axial portions (13) of the strips for acting on the axial end faces (23) of the magnets.
- Rotor body (1) according to Claim 1, wherein the strips (10) are locked by a connection (15) with snap-in means.
- Rotor body (1) according to Claim 2, wherein the snap-in means (15) concern the third portion of the strips.
- Rotor body (1) according to Claim 3, wherein the third portion (14) of the strips includes two parts, one of the parts including a hole while the other part includes an inclined lug intended to penetrate the hole.
- Body according to Claim 4, wherein the part, with a hole, of the third portion (14) of the strips (10) is not as wide as the one comprising the inclined lug.
- Rotor body (1) according to any one of the preceding claims, wherein the flexible radial (16) and axial (16') action means of a strip are formed by a curved form of the first portion (11) of the strip and by a curved form of at least one of the second portions (13) of the strip, respectively.
- Rotor body (1) according to Claim 6, wherein the flexible axial action means (16') are formed by a curved form of each of the second portions (13) of the strip.
- Rotor body (1) according to Claim 6 or 7, wherein the mortise (12) of a strip concerns the curved form of the first portion of the strip, such that the first portion of the strip is split.
- Rotor body (1) according to one of Claims 6 to 8, wherein the curved forms of the flexible axial (16') and radial (16) action means bear locally, via their top, on the opposite faces of a magnet (20) surrounded by the strip.
- Rotor body (1) according to one of Claims 1 to 6, wherein the flexible axial action means (16') are formed by inclined tabs originating from at least one of the second portions of a strip.
- Rotor body (1) according to any one of the preceding claims, wherein the magnetic part (4) includes arms (4) made of magnetic material with a radial overall orientation.
- Rotor body (1) according to Claim 11, wherein each arm (4) has, at its outer periphery, circumferential extensions (5), such as lips, extending on either side of the arm.
- Rotor body (1) according to Claim 11 or 12, wherein the core (100) belongs to the magnetic part.
- Rotor body (1) according to Claim 11 or 12, wherein the arms (4) are added to the central core made of non-magnetic material.
- Rotor body according to Claim 13, wherein the central core (100) consists of a hub made of non-magnetic material joined to a motion transmission flange.
- Rotor body (1) according to any one of the preceding claims, wherein the magnets (20) are magnets are made of ferrite.
- Rotor body (1) according to any one of the preceding claims, wherein the strips (10) are made of non-magnetic material, such as stainless steel.
- Rotating electrical machine, in particular an alternator, a starter-alternator or an electric motor for a motor vehicle, comprising a rotor body (1) according to any one of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1558146A FR3040834B1 (en) | 2015-09-03 | 2015-09-03 | PERMANENT MAGNET ROTOR BODY AND ROTATING ELECTRIC MACHINE COMPRISING SUCH A BODY |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3139470A1 EP3139470A1 (en) | 2017-03-08 |
EP3139470B1 true EP3139470B1 (en) | 2018-07-25 |
Family
ID=55135273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16182076.6A Not-in-force EP3139470B1 (en) | 2015-09-03 | 2016-07-29 | Rotor body with permanent magnets and rotating electrical machine comprising such a body |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3139470B1 (en) |
CN (1) | CN106505762A (en) |
FR (1) | FR3040834B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102527782B1 (en) * | 2017-12-18 | 2023-05-02 | 엘지이노텍 주식회사 | Rotor and Motor having the same |
DE102017223042A1 (en) * | 2017-12-18 | 2019-06-19 | Volkswagen Aktiengesellschaft | Rotor or stator arrangement with permanent magnets |
US20190386551A1 (en) * | 2018-06-13 | 2019-12-19 | Mitsubishi Heavy Industries, Ltd. | Coil, rotating electrical machine, rotating electrical machine system, and method of manufacturing permanent magnet |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2745444B1 (en) | 1996-02-28 | 1998-05-07 | Valeo Electronique | AUTOMOTIVE VEHICLE ALTERNATOR OPERATING AS A GENERATOR AND AN ELECTRIC MOTOR AND METHOD FOR CONTROLLING SUCH AN ALTERNATOR |
EP0881742B1 (en) | 1997-05-26 | 2004-04-21 | Denso Corporation | AC generator for vehicles |
FR2782356B1 (en) | 1998-07-28 | 2001-03-23 | Valeo Equip Electr Moteur | FRICTION CLUTCH CARRYING THE ROTOR OF AN ELECTRIC MACHINE, PARTICULARLY FOR A MOTOR VEHICLE |
FR2819350B1 (en) | 2001-01-05 | 2003-04-11 | Valeo Equip Electr Moteur | IMPROVED ROTATING MACHINE FOR MOTOR VEHICLES |
FR2830589B1 (en) | 2001-10-08 | 2004-04-23 | Valeo | AUTOMOTIVE VEHICLE TRANSMISSION KIT INCLUDING TWO CLUTCHES AND AN ELECTRIC MACHINE |
JP3743431B2 (en) * | 2002-04-26 | 2006-02-08 | 株式会社日立製作所 | Vehicle alternator and its rotor |
JP2006283683A (en) | 2005-04-01 | 2006-10-19 | Sanden Corp | Hybrid compressor |
JP2010016958A (en) * | 2008-07-02 | 2010-01-21 | Hitachi Ltd | Rotating electrical machine |
JP5146184B2 (en) * | 2008-08-01 | 2013-02-20 | 株式会社デンソー | Method for manufacturing magnet field motor |
DE102008043144B4 (en) * | 2008-10-24 | 2017-08-17 | Robert Bosch Gmbh | Device for fixing magnets |
JP5427576B2 (en) * | 2009-12-04 | 2014-02-26 | 日立オートモティブシステムズ株式会社 | Rotating electric machine for vehicles |
ITBO20110587A1 (en) * | 2011-10-17 | 2013-04-18 | Spal Automotive Srl | ROTOR FOR ELECTRIC MACHINE AND ITS ASSEMBLY PROCEDURE |
FR3005900B1 (en) | 2013-05-22 | 2015-06-05 | Valeo Equip Electr Moteur | DEVICE FOR A HYBRID VEHICLE WITH A SUPPORT HUB OF A ROTOR MADE OF A SHEET AND CARRYING A PLATE OF REACTION OF A CLUTCH |
FR3005589B1 (en) | 2013-05-14 | 2015-09-04 | Participations G | MACHINE FOR FOLDING A FLAN |
FR3008252B1 (en) | 2013-07-04 | 2015-08-07 | Valeo Equip Electr Moteur | PERMANENT MAGNET ROTOR BODY AND ROTATING ELECTRIC MACHINE COMPRISING SUCH A BODY |
JP2015027161A (en) * | 2013-07-25 | 2015-02-05 | 株式会社東芝 | Rotary electric machine |
DE102013226379A1 (en) * | 2013-12-18 | 2015-06-18 | Robert Bosch Gmbh | Electric machine with at least two clamping lugs for fixing a permanent magnet |
EP2975730A1 (en) * | 2014-07-17 | 2016-01-20 | Siemens Aktiengesellschaft | Rotor package of a rotating electric machine |
-
2015
- 2015-09-03 FR FR1558146A patent/FR3040834B1/en not_active Expired - Fee Related
-
2016
- 2016-07-29 EP EP16182076.6A patent/EP3139470B1/en not_active Not-in-force
- 2016-08-31 CN CN201610796644.5A patent/CN106505762A/en active Pending
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
FR3040834A1 (en) | 2017-03-10 |
FR3040834B1 (en) | 2017-08-25 |
EP3139470A1 (en) | 2017-03-08 |
CN106505762A (en) | 2017-03-15 |
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